Gold Member

Well I am an engineer and always carry some measurement tools into the sack with me

I would assume that unless its someone that you have an on going relationship with that it would only be a guess...and him giving you the dimensions don't count as they are usually exaggerating. But I wasn't completely joking about the engineering tools comment. If its impressive I will nonchalantly make comparisons to my hand/arm for length and measure that reference later. So with that method the longest was a little over 10 inches.